Fabrication et étude d'un monocristal de vortex dans le niobium supraconducteur

Thorel, P.; Kahn, R.; Simon, Y.; Cribier, D.

doi:10.1051/jphys:01973003405-6044700

Cited by 69 publications

(30 citation statements)

References 9 publications

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“…30). These findings agree well with neutron scattering experiments on moving FL lattices in type II superconductors [31). All…”

Section: Voltage-current Characteristicssupporting

confidence: 87%

Simulations of Relaxation, Pinning, and Melting in Flux Lattices

Jensen

1993

Phase Transitions and Relaxation in Systems With Competing Energy Scales

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Fundamental aspects of the physics of an elastic medium in a static random background potential are discussed by use of one -and two dimensional computer simulations. The role of non-linear elastic instabilities and plastic deformations are treated in detail. Elastic instabilities are needed for the existence of a pinning force. In the limit of infinite system size plastic deformations always occur.

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“…30). These findings agree well with neutron scattering experiments on moving FL lattices in type II superconductors [31). All…”

Section: Voltage-current Characteristicssupporting

confidence: 87%

Simulations of Relaxation, Pinning, and Melting in Flux Lattices

Jensen

1993

Phase Transitions and Relaxation in Systems With Competing Energy Scales

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“…This is related to dynamical ordering in the vortex lattice at high vortex velocities 11,22 . Therefore, the field and temperature dependence of the critical current is affected by random pinning and complicates the interpretation of the pinning mechanism by the magnetic dots.…”

mentioning

confidence: 99%

Temperature dependence and mechanisms of vortex pinning by periodic arrays of Ni dots in Nb films

et al. 2000

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Pinning interactions between superconducting vortices in Nb and magnetic Ni dots were studied as a function of current and temperature to clarify the nature of pinning mechanisms. A strong current dependence is found for a square array of dots, with a temperature-dependent optimumcurrent for the observation of periodic pinning, that decreases with temperature as (1 − T /TC) 3/2 . This same temperature dependence is found for the critical current at the first matching field with a rectangular array of dots. The analysis of these results allows to narrow the possible pinning mechanisms to a combination of two: the interaction between the vortex and the magnetic moment of the dot and the proximity effect. Moreover, for the rectangular dot array, the temperature dependence of the crossover between the low field regime with a rectangular vortex lattice to the high field regime with a square configuration has been studied. It is found that the crossover field increases with decreasing temperature. This dependence indicates a change in the balance between elastic and pinning energies, associated with dynamical effects of the vortex lattice in the high field range.

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“…Rather than analyzing the smearing of peaks in a quantitative manner, we consider instead the opposite limiting case of a completely uncorrelated ͑amorphous/liquid͒ vortex system. Although this limiting case is not physical, [7][8][9] it nevertheless establishes a useful limit. The real situation, and the corresponding current-voltage curve, will lie between the two limiting cases of perfect lattice and uncorrelated vortices.…”

Section: Uncorrelated Vortex Systemmentioning

confidence: 99%

“…At high vortex velocities this is indeed the case, through the well-known process of dynamic crystallization. [7][8][9] Thus in the regime of highly driven flux flow the resonances ought to be observable.…”

Section: Introductionmentioning

confidence: 99%

Cherenkov resonances in vortex dissipation in superconductors

Mejía-Rosales

Kunchur

1999

Phys. Rev. B

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When the velocity of vortices in a superconductor in the free flux flow regime exceeds the velocity of sound, each vortex produces Cherenkov radiation of sound waves. The velocity field of the lattice ions is localized on the Cherenkov cone, but the forces acting on the lattice are localized on the vortex positions. When the Cherenkov cone coincides with certain directions in the moving vortex lattice, the dissipation exhibits maxima. Since the direction of the Cherenkov cone is determined by the vortex velocity ͑electric field͒ one can expect a series of resonant peaks in the current-voltage characteristic at particular values of electric field.

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Fabrication et étude d'un monocristal de vortex dans le niobium supraconducteur

Cited by 69 publications

References 9 publications

Simulations of Relaxation, Pinning, and Melting in Flux Lattices

Simulations of Relaxation, Pinning, and Melting in Flux Lattices

Temperature dependence and mechanisms of vortex pinning by periodic arrays of Ni dots in Nb films

Cherenkov resonances in vortex dissipation in superconductors

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